AMARILLO - Three Pantex employees remain on paid administrative leave for violating nuclear safety procedures after workers failed to keep a close lookout on a nuclear warhead for a few minutes last week, a top Pantex official said Wednesday. The incident violated long-standing "buddy system" rules aimed at preventing unauthorized access to nuclear weapons. B&W Pantex President and General Manager Dan Swaim said workers failed to keep proper visual surveillance of the warhead for less than eight minutes on Jan. 10. A fourth employee entered the area and discovered the violation, which was promptly corrected. The warhead remained under protective...